.\" $OpenBSD: X509_NAME_ENTRY_get_object.3,v 1.13 2019/06/14 13:59:32 schwarze Exp $
.\" full merge up to: OpenSSL aebb9aac Jul 19 09:27:53 2016 -0400
.\" selective merge up to: OpenSSL 61f805c1 Jan 16 01:01:46 2018 +0800
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.\" Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
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.Dd $Mdocdate: June 14 2019 $
.Dt X509_NAME_ENTRY_GET_OBJECT 3
.Os
.Sh NAME
.Nm X509_NAME_ENTRY_new ,
.Nm X509_NAME_ENTRY_free ,
.Nm X509_NAME_ENTRY_get_object ,
.Nm X509_NAME_ENTRY_get_data ,
.Nm X509_NAME_ENTRY_set_object ,
.Nm X509_NAME_ENTRY_set_data ,
.Nm X509_NAME_ENTRY_create_by_txt ,
.Nm X509_NAME_ENTRY_create_by_NID ,
.Nm X509_NAME_ENTRY_create_by_OBJ
.\" In the following line, "X.501" is not a typo.
.\" This object defined in X.501, not in X.509.
.Nd X.501 relative distinguished name
.Sh SYNOPSIS
.In openssl/x509.h
.Ft X509_NAME_ENTRY *
.Fn X509_NAME_ENTRY_new void
.Ft void
.Fo X509_NAME_ENTRY_free
.Fa "X509_NAME_ENTRY* ne"
.Fc
.Ft ASN1_OBJECT *
.Fo X509_NAME_ENTRY_get_object
.Fa "const X509_NAME_ENTRY *ne"
.Fc
.Ft ASN1_STRING *
.Fo X509_NAME_ENTRY_get_data
.Fa "const X509_NAME_ENTRY *ne"
.Fc
.Ft int
.Fo X509_NAME_ENTRY_set_object
.Fa "X509_NAME_ENTRY *ne"
.Fa "const ASN1_OBJECT *obj"
.Fc
.Ft int
.Fo X509_NAME_ENTRY_set_data
.Fa "X509_NAME_ENTRY *ne"
.Fa "int type"
.Fa "const unsigned char *bytes"
.Fa "int len"
.Fc
.Ft X509_NAME_ENTRY *
.Fo X509_NAME_ENTRY_create_by_txt
.Fa "X509_NAME_ENTRY **ne"
.Fa "const char *field"
.Fa "int type"
.Fa "const unsigned char *bytes"
.Fa "int len"
.Fc
.Ft X509_NAME_ENTRY *
.Fo X509_NAME_ENTRY_create_by_NID
.Fa "X509_NAME_ENTRY **ne"
.Fa "int nid"
.Fa "int type"
.Fa "const unsigned char *bytes"
.Fa "int len"
.Fc
.Ft X509_NAME_ENTRY *
.Fo X509_NAME_ENTRY_create_by_OBJ
.Fa "X509_NAME_ENTRY **ne"
.Fa "const ASN1_OBJECT *obj"
.Fa "int type"
.Fa "const unsigned char *bytes"
.Fa "int len"
.Fc
.Sh DESCRIPTION
An X.501
.Vt RelativeDistinguishedName
is a set of field type and value pairs.
It is the building block for constructing X.501
.Vt Name
objects.
This implementation only supports sets with one element, so an
.Vt X509_NAME_ENTRY
object contains only one field type and one value.
.Pp
.Fn X509_NAME_ENTRY_new
allocates and initializes an empty
.Vt X509_NAME_ENTRY
object, representing an ASN.1
.Vt RelativeDistinguishedName
structure defined in RFC 5280 section 4.1.2.4.
.Pp
.Fn X509_NAME_ENTRY_free
frees
.Fa ne
and the type and value contained in it.
.Pp
.Fn X509_NAME_ENTRY_get_object
retrieves the field type of
.Fa ne
in an
.Vt ASN1_OBJECT
structure.
.Fn X509_NAME_ENTRY_get_data
retrieves the field value of
.Fa ne
in an
.Vt ASN1_STRING
structure.
These two functions can be used to examine an
.Vt X509_NAME_ENTRY
object as returned by
.Xr X509_NAME_get_entry 3 .
.Pp
.Fn X509_NAME_ENTRY_set_object
sets the field type of
.Fa ne
to
.Fa obj .
.Pp
.Fn X509_NAME_ENTRY_set_data
sets the field value of
.Fa ne
to string type
.Fa type
and the value determined by
.Fa bytes
and
.Fa len .
.Pp
.Fn X509_NAME_ENTRY_create_by_txt ,
.Fn X509_NAME_ENTRY_create_by_NID ,
and
.Fn X509_NAME_ENTRY_create_by_OBJ
create and return an
.Vt X509_NAME_ENTRY
structure.
.Pp
Except for
.Fn X509_NAME_ENTRY_get_object
and
.Fn X509_NAME_ENTRY_get_data ,
these functions are rarely used because
.Vt X509_NAME_ENTRY
structures are almost always part of
.Vt X509_NAME
structures and the functions described in
.Xr X509_NAME_add_entry_by_txt 3
are typically used to create and add new entries in a single operation.
.Pp
The arguments of these functions support similar options to the
similarly named ones described in
.Xr X509_NAME_add_entry_by_txt 3 .
So for example
.Fa type
can be set to
.Dv MBSTRING_ASC ,
but in the case of
.Fn X509_NAME_ENTRY_set_data
the field type must be set first so the relevant field information
can be looked up internally.
.Sh RETURN VALUES
The
.Fn X509_NAME_ENTRY_new
function returns a valid
.Vt X509_NAME_ENTRY
structure if successful; otherwise
.Dv NULL
is returned and an error code can be retrieved with
.Xr ERR_get_error 3 .
.Pp
.Fn X509_NAME_ENTRY_get_object
returns a valid
.Vt ASN1_OBJECT
structure if it is set or
.Dv NULL
if an error occurred.
.Pp
.Fn X509_NAME_ENTRY_get_data
returns a valid
.Vt ASN1_STRING
structure if it is set or
.Dv NULL
if an error occurred.
.Pp
The
.Fn X509_NAME_ENTRY_set_object
function returns 1 if successful;
otherwise 0 is returned and an error code can be retrieved with
.Xr ERR_get_error 3 .
.Pp
.Fn X509_NAME_ENTRY_set_data
return 1 on success or 0 on error.
In some cases of failure, the reason can be determined with
.Xr ERR_get_error 3 .
.Pp
.Fn X509_NAME_ENTRY_create_by_txt ,
.Fn X509_NAME_ENTRY_create_by_NID ,
and
.Fn X509_NAME_ENTRY_create_by_OBJ
return a valid
.Vt X509_NAME_ENTRY
structure on success or
.Dv NULL
if an error occurred.
In some cases of failure, the reason can be determined with
.Xr ERR_get_error 3 .
.Sh SEE ALSO
.Xr OBJ_nid2obj 3 ,
.Xr X509_NAME_add_entry 3 ,
.Xr X509_NAME_get_entry 3 ,
.Xr X509_NAME_new 3
.Sh STANDARDS
RFC 5280: Internet X.509 Public Key Infrastructure Certificate and
Certificate Revocation List (CRL) Profile
.Pp
ITU-T Recommendation X.501, also known as ISO/IEC 9594-2: Information
Technology  Open Systems Interconnection  The Directory: Models,
section 9.3: Relative distinguished name
.Sh HISTORY
.Fn X509_NAME_ENTRY_new
and
.Fn X509_NAME_ENTRY_free
first appeared in SSLeay 0.5.1.
.Fn X509_NAME_ENTRY_get_object ,
.Fn X509_NAME_ENTRY_get_data ,
.Fn X509_NAME_ENTRY_set_object ,
.Fn X509_NAME_ENTRY_set_data ,
.Fn X509_NAME_ENTRY_create_by_NID ,
and
.Fn X509_NAME_ENTRY_create_by_OBJ
first appeared in SSLeay 0.8.0.
These functions have been available since
.Ox 2.4 .
.Pp
.Fn X509_NAME_ENTRY_create_by_txt
first appeared in OpenSSL 0.9.5 and has been available since
.Ox 2.7 .
